Contents

Introduction

This document describes the behavior of the Session Initiation Protocol (SIP) dialer in the Cisco Unified Contact Center Enterprise (UCCE) environment when the gateway sends a Bye Message after it did not detect Answer machine Termination Tone.

Dialer Configuration: Transfer to IVR Route Point and Terminate Tone Detect have been ticked

When the geteway detect Answer machine, but did not determine Answer machine Termination Tone, it sends Bye message to SIP dialer. The SIP dialer sends back “ SIP/2.0 415 Unsupported Media Type. In this case the call cannot be terminated and the agent cannot return back to ready status for approximately 18 minutes.

When the Gateway sends CPA with AsmT ( answer machine termination Tone ) , then the call can be refered to the VRU leg.

< without AsmT>

< with AsmT>

Solution

Analysis:

the QSIG message encapsulated in the SIP messaging contains A multipart-MiME body.

A Multipart-MIME body—message part containing the tunneled QSIG data.

In the SIP TDM gateway scenario, there are two options—raw message (rawmsg) and unconditional. The rawmsg option specifies tunneling of only raw message (application/qsig or application/x-q931). The unconditional option specifies tunneling of all additional message bodies, such as GTD and raw message (application/qsig or application/x-q931).

You should expect a SIP 415 final response message (Unsupported Media Type) if the User Agent Server (UAS) is unable to process tunneled QSIG or Q.931 messages